java.lang.IllegalArgumentException：区域设置部分“en-US，en;q=0.9”包含无效字符]答案

【问题标题】：java.lang.IllegalArgumentException: Locale part "en-US,en;q=0.9" contains invalid characters]java.lang.IllegalArgumentException：区域设置部分“en-US，en;q=0.9”包含无效字符]
【发布时间】：2020-07-05 11:23:15
【问题描述】：

当我在 Postman 中输入以下 URL http://localhost:8080/hello-world-internationalized 时收到 400 bad request 如果我指定不需要的“Accept-Language”，情况并非如此事实上我得到以下异常

2020-07-05 12:02:43.617 WARN 7744 --- [nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver：已解决 [org.springframework.web.method.annotation.MethodArgumentTypeMismatchException：无法转换键入“java.lang.String”到所需类型“java.util.Locale”；嵌套异常是 java.lang.IllegalArgumentException: Locale part "en-US,en;q=0.9" contains invalid characters]

这是我的控制器

package com.in28minutes.rest.webservices.restfulwebservices.helloworld;

import java.util.Locale;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorldController {
    @Autowired
    private MessageSource messageSource;

@GetMapping(path ="/hello-world")
public String helloWorld() {
    return "Hello World!"; 
}

@GetMapping(path ="/hello-world-bean")
public HelloWorldBean helloWorldBean() {
    return new HelloWorldBean("Hello World!"); 
}

@GetMapping(path ="/hello-world-bean/path-variable/{name}")
public HelloWorldBean helloWorldPathVariable(@PathVariable String name) {
    return new HelloWorldBean(String.format("Hello, %s", name)); 
}

@GetMapping(path ="/hello-world-internationalized")
public String helloWorldInternationalized(@RequestHeader(name = "Accept-Language", required = false) Locale locale) {
    return messageSource.getMessage("good.morning.message", null, locale); 
}

}

和

    package com.in28minutes.rest.webservices.restfulwebservices;

import java.util.Locale;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.context.support.ResourceBundleMessageSource;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.i18n.AcceptHeaderLocaleResolver;

@SpringBootApplication
public class RestfulWebServicesApplication {
    

    public static void main(String[] args) {
        SpringApplication.run(RestfulWebServicesApplication.class, args);
    }
    
    @Bean
    public LocaleResolver localeResolver() {
        AcceptHeaderLocaleResolver localeResolver= new AcceptHeaderLocaleResolver();
        localeResolver.setDefaultLocale(Locale.US);
        return localeResolver;
    }
    
    @Bean
    public ResourceBundleMessageSource messageSource() {
        ResourceBundleMessageSource messageSource= new ResourceBundleMessageSource();
        messageSource.setBasename("messages");
        return messageSource;
    }
    
}

我在选择 Spring Boot 2.1.15、Java、Maven 项目和 Web、DevTools、JPA 和 H2 等依赖项时使用 Spring Intializr 创建了项目。

【问题讨论】：

标签： spring spring-boot internationalization

【解决方案1】：

更改方法签名。而不是

@GetMapping(path ="/hello-world-internationalized")
public String helloWorldInternationalized(@RequestHeader(name = "Accept-Language", required = false) Locale locale) {
    return messageSource.getMessage("good.morning.message", null, locale); 
}

像下面这样写

@GetMapping(path ="/hello-world-internationalized")
public String helloWorldInternationalized(@RequestHeader(name = "Accept-Language", required = false) String localeString) {
Locale locale = new Locale(localeString);
    return messageSource.getMessage("good.morning.message", null, locale); 
}

这是解决方法之一。

【讨论】：